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本文基于包含流动和传热两个方面的电路类比理论,针对一具有环路结构的气液相变热声发动机系统进行了模拟计算和分析。重点讨论了排出器、动力活塞、反馈管以及负载液柱的直径和长度对于系统谐振频率和换热器驱动温度梯度的影响。结果显示,该气液相变热声发动机的谐振频率较低(小于1 Hz),排出器和动力活塞的直径,以及反馈管的直径和长度对于谐振频率的影响较大;气液相变热声发动机所需驱动温度梯度比通常气体工质热声发动机小一到两个数量级,各主要部件的直径对气液相变热声发动机所需驱动温度梯度的影响比长度对其影响更为显著。
Based on the circuit analogy theory including flow and heat transfer, this paper simulates and analyzes a gas-liquid phase-change thermoacoustic engine with a loop structure. The effects of displacer, power piston, feedback tube and the diameter and length of liquid column on the resonance frequency of the system and the driving temperature gradient of heat exchanger are discussed. The results show that the resonance frequency of the gas-liquid phase-change thermoacoustic engine is low (less than 1 Hz), the diameter of the ejector and the power piston, and the diameter and length of the feedback pipe have a great influence on the resonance frequency. The driving temperature gradient required for the acoustic engine is one to two orders of magnitude smaller than that of the conventional gas-engine thermoacoustic engine. The diameter of each major component has a more significant effect on the driving temperature gradient required for the gas-liquid phase change thermoacoustic engine than its length .